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On May 3, 2002, with the reactor at 100% p … On May 3, 2002, with the reactor at 100% power, Unit 1 experienced an automatic reactor trip due to an indicated Pump (RCP) bus were in a tripped condition due to surveillance testing in progress. While reconnecting power leads to the neutron flux recorder following recorder repair, the tape on an energized power lead was inadvertently breached and the lead was shorted to ground. The short caused an undervoltage condition on the B vital instrument bus. The B vital instrument bus is the power supply for the recorder as well as the B RCP undervoltage relays. As a result of the "A" RCP bus undervoltage relays tripped for testing and drop out of the "B" RCP bus undervoltage relays due to the shorted power lead, the coincidence necessary to generate a RCP bus undervoltage reactor trip signal resulting from the "B" vital instrument bus undervoltage condition alone. All safeguards equipment functioned as designed following the trip. All RCPs continued to operate throughout the event.</br></br>The event was caused by an inadequate work order planning and scheduling process which did not consider potential consequences of energized work. A second cause was inadequate management expectations with respect to taping of electrical leads.</br></br>Procedural guidance has been developed to require work planning to specifically identify work activities associated with energized conductors and the affected power source. Procedural guidance has been developed to evaluate work activities involving energized conductors during work scheduling. Procedural guidance has been developed and personnel working on energized conductors have been trained on enhanced taping/insulating techniques for energized leads.insulating techniques for energized leads. +
On May 3, 2002, with the reactor at 100% p … On May 3, 2002, with the reactor at 100% power, Unit 1 experienced an automatic reactor trip due to an indicated Pump (RCP) bus were in a tripped condition due to surveillance testing in progress. While reconnecting power leads to the neutron flux recorder following recorder repair, the tape on an energized power lead was inadvertently breached and the lead was shorted to ground. The short caused an undervoltage condition on the B vital instrument bus. The B vital instrument bus is the power supply for the recorder as well as the B RCP undervoltage relays. As a result of the "A" RCP bus undervoltage relays tripped for testing and drop out of the "B" RCP bus undervoltage relays due to the shorted power lead, the coincidence necessary to generate a RCP bus undervoltage reactor trip signal resulting from the "B" vital instrument bus undervoltage condition alone. All safeguards equipment functioned as designed following the trip. All RCPs continued to operate throughout the event.</br></br>The event was caused by an inadequate work order planning and scheduling process which did not consider potential consequences of energized work. A second cause was inadequate management expectations with respect to taping of electrical leads.</br></br>Procedural guidance has been developed to require work planning to specifically identify work activities associated with energized conductors and the affected power source. Procedural guidance has been developed to evaluate work activities involving energized conductors during work scheduling. Procedural guidance has been developed and personnel working on energized conductors have been trained on enhanced taping/insulating techniques for energized leads.insulating techniques for energized leads. +
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